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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ce86fabb11dcb4365dd2d06f0db2c882595e37a7e533bf3b700c2d800fbda9' 
  AND token = '8Hy8FKwzKLH7n4KZFO0P948u0pDnNx8HbVuRpV6QuTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}